Palette knife



FIG. 1 is a top plan view of a palette knife showing my new design;

FIG. 2 is a side elevational view thereof;

FIG. 3 is a bottom plan view thereof;

FIG. 4 is an end elevational view thereof as seen from the left of FIG. 2; and

FIG. 5 is an end elevational view thereof as seen from the right of FIG. 2. 

The ornamental design for a palette knife, substantially as shown and described. 